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4
Coefficient of friction depends on
A. Nature of surfaces only
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A pilot flies a small plane in a vertical loop of radius r. At the top of its trajectory he experiences weightlessness. If the acceleration due to gravity is g, the speed of the plane at the top of its trajectory would be
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4
The diagram showing the point of application and line of action of forces in their plane is called
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The motion of a particle is described by the relation x = t2- 10t + 30, where x is in metres and t in seconds. The total distance travelled by the particle from t = 0 to t = 10 seconds would be
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4
Minimum potential energy of a system will be in the position of
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4
The resultant of two forces P and Q is R. If Q is doubled, the new resultant is perpendicular to P. Then,
D. None of the above is correct
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4
The unit of force in C.G.S. system of units, is called
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An ordinate in a funicular polygon represents
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A spring scale in a stationary lift shows a reading of 60 kg for a man standing on it. If the lift starts descending at an acceleration of g/5, the scale reading would be
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4
The mechanical advantage of an ideal machine is 100. For moving the local through 2 m, the effort moves through
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4
The centre of gravity of a plane lamina will not be at its geometrical centre if it is a
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Time of flight of a projectile on a horizontal plane, is
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A sphere and a cylinder having the same mass and radii start from rest and roll down the same inclined plane. Which body gets to the bottom first?
A. Sphere with greater rotational energy at bottom than cylinder
B. Sphere with lesser rotational energy at bottom than cylinder
C. Cylinder with greater rotational energy at bottom than sphere
D. Both reach the bottom simultaneously with equal rotational energy at bottom
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4
The C.G. of a right circular cone lies on its axis of symmetry at a height of
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4
The reaction at the support A of the beam shown in below figure is
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If the linear velocity of a point on the rim of a wheel of 10 m diameter, is 50 m/sec, its angular velocity will be
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Periodic time of a particle moving with simple harmonic motion is the time taken by the particle for
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The product of mass and velocity of a moving a body, is called
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A simple pendulum of length 1 has an energy E when its amplitude is A. If its amplitude is increased to 2 A, the energy becomes
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4
The motion of a particle moving with S.H.M. from an extremity to the other, constitutes
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A square hole is made in a circular lamina, the diagonal of the square is equal to the radius of the circle as shown in below figure the shift in the centre of gravity is
A. r (π - 0.75)/(π - 0.5)
B. r (π - 0.25)/(π - 0.75)
C. r (π - 0.5)/(π - 0.75)
D. r (π - 0.5)/(π - 0.25)
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The length of a Second's pendulum, is
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A disc of mass 4 kg, radius 0.5 m and moment of inertia 3 kgm² rolls on a horizontal surface so that its center moves with speed 5 m/see. Kinetic energy of the disc is
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4
The force acting on a point on the surface of a rigid body may be considered to act
A. At the centre of gravity of the body
B. On the periphery of the body
C. On any point on the line of action of the force
D. At any point on the surface normal to the line of action of the force
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4
A particle moves along a straight line such that distance x traversed in t seconds is given by x = t2(t + 1), the acceleration of the particle, will be
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The ends of a string weighing w/metre are attached to two points at the same horizontal level. If the central dip is very small, the horizontal tension of the string throughout is
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Pick up the correct statement from the following for the structure shown in below figure.
A. The horizontal reaction at A is 2 √3t ←
B. The horizontal reaction at C is 2 √3t →
C. The vertical reaction at A is zero
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4
Williot-Mohr diagram is used to determine deflection in
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Engineer's units of force, is
A. Newton in absolute units
B. Dyne in absolute units
C. Newton and dyne in absolute units
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Moment of inertia of a squares of side b about an axis through its centre of gravity, is